Add cloudstack.html.md documentation of eject_iso and eject_iso_delay options

Usages and behavior.

website/source/docs/builders/cloudstack.html.md

@@ -111,6 +111,16 @@ builder.
 -   `hypervisor` (string) - The target hypervisor (e.g. `XenServer`, `KVM`) for
     the new template. This option is required when using `source_iso`.
 
+-   `eject_iso` (boolean) - If `true`, make a call to the CloudStack API, after 
+    loading image to cache requesting to check and detach ISO file (if any) 
+    currently attached to a virtual machine. Defaults to `false`. This option 
+    is only available when using `source_iso`.
+
+-   `eject_iso_delay` (time.Duration) - Configure the duration time to wait, making
+    sure virtual machine is able to finish installing OS before it ejects safely. 
+    Requires `eject_iso` set to `true` and this option is only available when 
+    using `source_iso`.
+
 -   `keypair` (string) - The name of the SSH key pair that will be used to
     access the instance. The SSH key pair is assumed to be already available
     within CloudStack.